Inevitably, the area affected by landslides is both remote and inaccessible in the aftermath of the earthquake, so a proper understanding of the landslides will take some time. In the meantime, there is some evidence that landslides have been a significant problem. The BBC has two images that show landslides. The first appears to be a simple rock slope failure:

http://www.bbc.co.uk/news/world-latin-america-20247046

Whilst the second is a slope failure in an aggregate quarry that is reported to have claimed seven lives: